A scooter starts from the origin and moves 120m east, then 50m west along the same straight road in a total time of 17s. Choose the correct statement about the magnitudes of its average speed and average velocity.
(a) Both magnitudes are equal.
(b) Both magnitudes are zero.
(c) Average speed is greater than magnitude of average velocity.
(d) Magnitude of average velocity is greater than average speed.